mailinfo.c

   1 /*
   2  * Another stupid program, this one parsing the headers of an
   3  * email to figure out authorship and subject
   4  */
   5 #define _GNU_SOURCE
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <ctype.h>
  10 #ifndef NO_ICONV
  11 #include <iconv.h>
  12 #endif
  13 #include "git-compat-util.h"
  14 #include "cache.h"
  15
  16 static FILE *cmitmsg, *patchfile;
  17
  18 static int keep_subject = 0;
  19 static char *metainfo_charset = NULL;
  20 static char line[1000];
  21 static char date[1000];
  22 static char name[1000];
  23 static char email[1000];
  24 static char subject[1000];
  25
  26 static enum  {
  27         TE_DONTCARE, TE_QP, TE_BASE64,
  28 } transfer_encoding;
  29 static char charset[256];
  30
  31 static char multipart_boundary[1000];
  32 static int multipart_boundary_len;
  33 static int patch_lines = 0;
  34
  35 static char *sanity_check(char *name, char *email)
  36 {
  37         int len = strlen(name);
  38         if (len < 3 || len > 60)
  39                 return email;
  40         if (strchr(name, '@') || strchr(name, '<') || strchr(name, '>'))
  41                 return email;
  42         return name;
  43 }
  44
  45 static int bogus_from(char *line)
  46 {
  47         /* John Doe <johndoe> */
  48         char *bra, *ket, *dst, *cp;
  49
  50         /* This is fallback, so do not bother if we already have an
  51          * e-mail address.
  52          */
  53         if (*email)
  54                 return 0;
  55
  56         bra = strchr(line, '<');
  57         if (!bra)
  58                 return 0;
  59         ket = strchr(bra, '>');
  60         if (!ket)
  61                 return 0;
  62
  63         for (dst = email, cp = bra+1; cp < ket; )
  64                 *dst++ = *cp++;
  65         *dst = 0;
  66         for (cp = line; isspace(*cp); cp++)
  67                 ;
  68         for (bra--; isspace(*bra); bra--)
  69                 *bra = 0;
  70         cp = sanity_check(cp, email);
  71         strcpy(name, cp);
  72         return 1;
  73 }
  74
  75 static int handle_from(char *line)
  76 {
  77         char *at = strchr(line, '@');
  78         char *dst;
  79
  80         if (!at)
  81                 return bogus_from(line);
  82
  83         /*
  84          * If we already have one email, don't take any confusing lines
  85          */
  86         if (*email && strchr(at+1, '@'))
  87                 return 0;
  88
  89         /* Pick up the string around '@', possibly delimited with <>
  90          * pair; that is the email part.  White them out while copying.
  91          */
  92         while (at > line) {
  93                 char c = at[-1];
  94                 if (isspace(c))
  95                         break;
  96                 if (c == '<') {
  97                         at[-1] = ' ';
  98                         break;
  99                 }
 100                 at--;
 101         }
 102         dst = email;
 103         for (;;) {
 104                 unsigned char c = *at;
 105                 if (!c || c == '>' || isspace(c)) {
 106                         if (c == '>')
 107                                 *at = ' ';
 108                         break;
 109                 }
 110                 *at++ = ' ';
 111                 *dst++ = c;
 112         }
 113         *dst++ = 0;
 114
 115         /* The remainder is name.  It could be "John Doe <john.doe@xz>"
 116          * or "john.doe@xz (John Doe)", but we have whited out the
 117          * email part, so trim from both ends, possibly removing
 118          * the () pair at the end.
 119          */
 120         at = line + strlen(line);
 121         while (at > line) {
 122                 unsigned char c = *--at;
 123                 if (!isspace(c)) {
 124                         at[(c == ')') ? 0 : 1] = 0;
 125                         break;
 126                 }
 127         }
 128
 129         at = line;
 130         for (;;) {
 131                 unsigned char c = *at;
 132                 if (!c || !isspace(c)) {
 133                         if (c == '(')
 134                                 at++;
 135                         break;
 136                 }
 137                 at++;
 138         }
 139         at = sanity_check(at, email);
 140         strcpy(name, at);
 141         return 1;
 142 }
 143
 144 static int handle_date(char *line)
 145 {
 146         strcpy(date, line);
 147         return 0;
 148 }
 149
 150 static int handle_subject(char *line)
 151 {
 152         strcpy(subject, line);
 153         return 0;
 154 }
 155
 156 /* NOTE NOTE NOTE.  We do not claim we do full MIME.  We just attempt
 157  * to have enough heuristics to grok MIME encoded patches often found
 158  * on our mailing lists.  For example, we do not even treat header lines
 159  * case insensitively.
 160  */
 161
 162 static int slurp_attr(const char *line, const char *name, char *attr)
 163 {
 164         char *ends, *ap = strcasestr(line, name);
 165         size_t sz;
 166
 167         if (!ap) {
 168                 *attr = 0;
 169                 return 0;
 170         }
 171         ap += strlen(name);
 172         if (*ap == '"') {
 173                 ap++;
 174                 ends = "\"";
 175         }
 176         else
 177                 ends = "; \t";
 178         sz = strcspn(ap, ends);
 179         memcpy(attr, ap, sz);
 180         attr[sz] = 0;
 181         return 1;
 182 }
 183
 184 static int handle_subcontent_type(char *line)
 185 {
 186         /* We do not want to mess with boundary.  Note that we do not
 187          * handle nested multipart.
 188          */
 189         if (strcasestr(line, "boundary=")) {
 190                 fprintf(stderr, "Not handling nested multipart message.\n");
 191                 exit(1);
 192         }
 193         slurp_attr(line, "charset=", charset);
 194         if (*charset) {
 195                 int i, c;
 196                 for (i = 0; (c = charset[i]) != 0; i++)
 197                         charset[i] = tolower(c);
 198         }
 199         return 0;
 200 }
 201
 202 static int handle_content_type(char *line)
 203 {
 204         *multipart_boundary = 0;
 205         if (slurp_attr(line, "boundary=", multipart_boundary + 2)) {
 206                 memcpy(multipart_boundary, "--", 2);
 207                 multipart_boundary_len = strlen(multipart_boundary);
 208         }
 209         slurp_attr(line, "charset=", charset);
 210         return 0;
 211 }
 212
 213 static int handle_content_transfer_encoding(char *line)
 214 {
 215         if (strcasestr(line, "base64"))
 216                 transfer_encoding = TE_BASE64;
 217         else if (strcasestr(line, "quoted-printable"))
 218                 transfer_encoding = TE_QP;
 219         else
 220                 transfer_encoding = TE_DONTCARE;
 221         return 0;
 222 }
 223
 224 static int is_multipart_boundary(const char *line)
 225 {
 226         return (!memcmp(line, multipart_boundary, multipart_boundary_len));
 227 }
 228
 229 static int eatspace(char *line)
 230 {
 231         int len = strlen(line);
 232         while (len > 0 && isspace(line[len-1]))
 233                 line[--len] = 0;
 234         return len;
 235 }
 236
 237 #define SEEN_FROM 01
 238 #define SEEN_DATE 02
 239 #define SEEN_SUBJECT 04
 240 #define SEEN_BOGUS_UNIX_FROM 010
 241
 242 /* First lines of body can have From:, Date:, and Subject: */
 243 static int handle_inbody_header(int *seen, char *line)
 244 {
 245         if (!memcmp(">From", line, 5) && isspace(line[5])) {
 246                 if (!(*seen & SEEN_BOGUS_UNIX_FROM)) {
 247                         *seen |= SEEN_BOGUS_UNIX_FROM;
 248                         return 1;
 249                 }
 250         }
 251         if (!memcmp("From:", line, 5) && isspace(line[5])) {
 252                 if (!(*seen & SEEN_FROM) && handle_from(line+6)) {
 253                         *seen |= SEEN_FROM;
 254                         return 1;
 255                 }
 256         }
 257         if (!memcmp("Date:", line, 5) && isspace(line[5])) {
 258                 if (!(*seen & SEEN_DATE)) {
 259                         handle_date(line+6);
 260                         *seen |= SEEN_DATE;
 261                         return 1;
 262                 }
 263         }
 264         if (!memcmp("Subject:", line, 8) && isspace(line[8])) {
 265                 if (!(*seen & SEEN_SUBJECT)) {
 266                         handle_subject(line+9);
 267                         *seen |= SEEN_SUBJECT;
 268                         return 1;
 269                 }
 270         }
 271         if (!memcmp("[PATCH]", line, 7) && isspace(line[7])) {
 272                 if (!(*seen & SEEN_SUBJECT)) {
 273                         handle_subject(line);
 274                         *seen |= SEEN_SUBJECT;
 275                         return 1;
 276                 }
 277         }
 278         return 0;
 279 }
 280
 281 static char *cleanup_subject(char *subject)
 282 {
 283         if (keep_subject)
 284                 return subject;
 285         for (;;) {
 286                 char *p;
 287                 int len, remove;
 288                 switch (*subject) {
 289                 case 'r': case 'R':
 290                         if (!memcmp("e:", subject+1, 2)) {
 291                                 subject +=3;
 292                                 continue;
 293                         }
 294                         break;
 295                 case ' ': case '\t': case ':':
 296                         subject++;
 297                         continue;
 298
 299                 case '[':
 300                         p = strchr(subject, ']');
 301                         if (!p) {
 302                                 subject++;
 303                                 continue;
 304                         }
 305                         len = strlen(p);
 306                         remove = p - subject;
 307                         if (remove <= len *2) {
 308                                 subject = p+1;
 309                                 continue;
 310                         }
 311                         break;
 312                 }
 313                 return subject;
 314         }
 315 }
 316
 317 static void cleanup_space(char *buf)
 318 {
 319         unsigned char c;
 320         while ((c = *buf) != 0) {
 321                 buf++;
 322                 if (isspace(c)) {
 323                         buf[-1] = ' ';
 324                         c = *buf;
 325                         while (isspace(c)) {
 326                                 int len = strlen(buf);
 327                                 memmove(buf, buf+1, len);
 328                                 c = *buf;
 329                         }
 330                 }
 331         }
 332 }
 333
 334 typedef int (*header_fn_t)(char *);
 335 struct header_def {
 336         const char *name;
 337         header_fn_t func;
 338         int namelen;
 339 };
 340
 341 static void check_header(char *line, int len, struct header_def *header)
 342 {
 343         int i;
 344
 345         if (header[0].namelen <= 0) {
 346                 for (i = 0; header[i].name; i++)
 347                         header[i].namelen = strlen(header[i].name);
 348         }
 349         for (i = 0; header[i].name; i++) {
 350                 int len = header[i].namelen;
 351                 if (!strncasecmp(line, header[i].name, len) &&
 352                     line[len] == ':' && isspace(line[len + 1])) {
 353                         header[i].func(line + len + 2);
 354                         break;
 355                 }
 356         }
 357 }
 358
 359 static void check_subheader_line(char *line, int len)
 360 {
 361         static struct header_def header[] = {
 362                 { "Content-Type", handle_subcontent_type },
 363                 { "Content-Transfer-Encoding",
 364                   handle_content_transfer_encoding },
 365                 { NULL },
 366         };
 367         check_header(line, len, header);
 368 }
 369 static void check_header_line(char *line, int len)
 370 {
 371         static struct header_def header[] = {
 372                 { "From", handle_from },
 373                 { "Date", handle_date },
 374                 { "Subject", handle_subject },
 375                 { "Content-Type", handle_content_type },
 376                 { "Content-Transfer-Encoding",
 377                   handle_content_transfer_encoding },
 378                 { NULL },
 379         };
 380         check_header(line, len, header);
 381 }
 382
 383 static int read_one_header_line(char *line, int sz, FILE *in)
 384 {
 385         int ofs = 0;
 386         while (ofs < sz) {
 387                 int peek, len;
 388                 if (fgets(line + ofs, sz - ofs, in) == NULL)
 389                         return ofs;
 390                 len = eatspace(line + ofs);
 391                 if (len == 0)
 392                         return ofs;
 393                 peek = fgetc(in); ungetc(peek, in);
 394                 if (peek == ' ' || peek == '\t') {
 395                         /* Yuck, 2822 header "folding" */
 396                         ofs += len;
 397                         continue;
 398                 }
 399                 return ofs + len;
 400         }
 401         return ofs;
 402 }
 403
 404 static unsigned hexval(int c)
 405 {
 406         if (c >= '0' && c <= '9')
 407                 return c - '0';
 408         if (c >= 'a' && c <= 'f')
 409                 return c - 'a' + 10;
 410         if (c >= 'A' && c <= 'F')
 411                 return c - 'A' + 10;
 412         return ~0;
 413 }
 414
 415 static int decode_q_segment(char *in, char *ot, char *ep, int rfc2047)
 416 {
 417         int c;
 418         while ((c = *in++) != 0 && (in <= ep)) {
 419                 if (c == '=') {
 420                         int d = *in++;
 421                         if (d == '\n' || !d)
 422                                 break; /* drop trailing newline */
 423                         *ot++ = ((hexval(d) << 4) | hexval(*in++));
 424                         continue;
 425                 }
 426                 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
 427                         c = 0x20;
 428                 *ot++ = c;
 429         }
 430         *ot = 0;
 431         return 0;
 432 }
 433
 434 static int decode_b_segment(char *in, char *ot, char *ep)
 435 {
 436         /* Decode in..ep, possibly in-place to ot */
 437         int c, pos = 0, acc = 0;
 438
 439         while ((c = *in++) != 0 && (in <= ep)) {
 440                 if (c == '+')
 441                         c = 62;
 442                 else if (c == '/')
 443                         c = 63;
 444                 else if ('A' <= c && c <= 'Z')
 445                         c -= 'A';
 446                 else if ('a' <= c && c <= 'z')
 447                         c -= 'a' - 26;
 448                 else if ('0' <= c && c <= '9')
 449                         c -= '0' - 52;
 450                 else if (c == '=') {
 451                         /* padding is almost like (c == 0), except we do
 452                          * not output NUL resulting only from it;
 453                          * for now we just trust the data.
 454                          */
 455                         c = 0;
 456                 }
 457                 else
 458                         continue; /* garbage */
 459                 switch (pos++) {
 460                 case 0:
 461                         acc = (c << 2);
 462                         break;
 463                 case 1:
 464                         *ot++ = (acc | (c >> 4));
 465                         acc = (c & 15) << 4;
 466                         break;
 467                 case 2:
 468                         *ot++ = (acc | (c >> 2));
 469                         acc = (c & 3) << 6;
 470                         break;
 471                 case 3:
 472                         *ot++ = (acc | c);
 473                         acc = pos = 0;
 474                         break;
 475                 }
 476         }
 477         *ot = 0;
 478         return 0;
 479 }
 480
 481 static void convert_to_utf8(char *line, char *charset)
 482 {
 483 #ifndef NO_ICONV
 484         char *in, *out;
 485         size_t insize, outsize, nrc;
 486         char outbuf[4096]; /* cheat */
 487         static char latin_one[] = "latin1";
 488         char *input_charset = *charset ? charset : latin_one;
 489         iconv_t conv = iconv_open(metainfo_charset, input_charset);
 490
 491         if (conv == (iconv_t) -1) {
 492                 static int warned_latin1_once = 0;
 493                 if (input_charset != latin_one) {
 494                         fprintf(stderr, "cannot convert from %s to %s\n",
 495                                 input_charset, metainfo_charset);
 496                         *charset = 0;
 497                 }
 498                 else if (!warned_latin1_once) {
 499                         warned_latin1_once = 1;
 500                         fprintf(stderr, "tried to convert from %s to %s, "
 501                                 "but your iconv does not work with it.\n",
 502                                 input_charset, metainfo_charset);
 503                 }
 504                 return;
 505         }
 506         in = line;
 507         insize = strlen(in);
 508         out = outbuf;
 509         outsize = sizeof(outbuf);
 510         nrc = iconv(conv, &in, &insize, &out, &outsize);
 511         iconv_close(conv);
 512         if (nrc == (size_t) -1)
 513                 return;
 514         *out = 0;
 515         strcpy(line, outbuf);
 516 #endif
 517 }
 518
 519 static void decode_header_bq(char *it)
 520 {
 521         char *in, *out, *ep, *cp, *sp;
 522         char outbuf[1000];
 523
 524         in = it;
 525         out = outbuf;
 526         while ((ep = strstr(in, "=?")) != NULL) {
 527                 int sz, encoding;
 528                 char charset_q[256], piecebuf[256];
 529                 if (in != ep) {
 530                         sz = ep - in;
 531                         memcpy(out, in, sz);
 532                         out += sz;
 533                         in += sz;
 534                 }
 535                 /* E.g.
 536                  * ep : "=?iso-2022-jp?B?GyR...?= foo"
 537                  * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
 538                  */
 539                 ep += 2;
 540                 cp = strchr(ep, '?');
 541                 if (!cp)
 542                         return; /* no munging */
 543                 for (sp = ep; sp < cp; sp++)
 544                         charset_q[sp - ep] = tolower(*sp);
 545                 charset_q[cp - ep] = 0;
 546                 encoding = cp[1];
 547                 if (!encoding || cp[2] != '?')
 548                         return; /* no munging */
 549                 ep = strstr(cp + 3, "?=");
 550                 if (!ep)
 551                         return; /* no munging */
 552                 switch (tolower(encoding)) {
 553                 default:
 554                         return; /* no munging */
 555                 case 'b':
 556                         sz = decode_b_segment(cp + 3, piecebuf, ep);
 557                         break;
 558                 case 'q':
 559                         sz = decode_q_segment(cp + 3, piecebuf, ep, 1);
 560                         break;
 561                 }
 562                 if (sz < 0)
 563                         return;
 564                 if (metainfo_charset)
 565                         convert_to_utf8(piecebuf, charset_q);
 566                 strcpy(out, piecebuf);
 567                 out += strlen(out);
 568                 in = ep + 2;
 569         }
 570         strcpy(out, in);
 571         strcpy(it, outbuf);
 572 }
 573
 574 static void decode_transfer_encoding(char *line)
 575 {
 576         char *ep;
 577
 578         switch (transfer_encoding) {
 579         case TE_QP:
 580                 ep = line + strlen(line);
 581                 decode_q_segment(line, line, ep, 0);
 582                 break;
 583         case TE_BASE64:
 584                 ep = line + strlen(line);
 585                 decode_b_segment(line, line, ep);
 586                 break;
 587         case TE_DONTCARE:
 588                 break;
 589         }
 590 }
 591
 592 static void handle_info(void)
 593 {
 594         char *sub;
 595         static int done_info = 0;
 596
 597         if (done_info)
 598                 return;
 599
 600         done_info = 1;
 601         sub = cleanup_subject(subject);
 602         cleanup_space(name);
 603         cleanup_space(date);
 604         cleanup_space(email);
 605         cleanup_space(sub);
 606
 607         /* Unwrap inline B and Q encoding, and optionally
 608          * normalize the meta information to utf8.
 609          */
 610         decode_header_bq(name);
 611         decode_header_bq(date);
 612         decode_header_bq(email);
 613         decode_header_bq(sub);
 614         printf("Author: %s\nEmail: %s\nSubject: %s\nDate: %s\n\n",
 615                name, email, sub, date);
 616 }
 617
 618 /* We are inside message body and have read line[] already.
 619  * Spit out the commit log.
 620  */
 621 static int handle_commit_msg(void)
 622 {
 623         if (!cmitmsg)
 624                 return 0;
 625         do {
 626                 if (!memcmp("diff -", line, 6) ||
 627                     !memcmp("---", line, 3) ||
 628                     !memcmp("Index: ", line, 7))
 629                         break;
 630                 if ((multipart_boundary[0] && is_multipart_boundary(line))) {
 631                         /* We come here when the first part had only
 632                          * the commit message without any patch.  We
 633                          * pretend we have not seen this line yet, and
 634                          * go back to the loop.
 635                          */
 636                         return 1;
 637                 }
 638
 639                 /* Unwrap transfer encoding and optionally
 640                  * normalize the log message to UTF-8.
 641                  */
 642                 decode_transfer_encoding(line);
 643                 if (metainfo_charset)
 644                         convert_to_utf8(line, charset);
 645                 fputs(line, cmitmsg);
 646         } while (fgets(line, sizeof(line), stdin) != NULL);
 647         fclose(cmitmsg);
 648         cmitmsg = NULL;
 649         return 0;
 650 }
 651
 652 /* We have done the commit message and have the first
 653  * line of the patch in line[].
 654  */
 655 static void handle_patch(void)
 656 {
 657         do {
 658                 if (multipart_boundary[0] && is_multipart_boundary(line))
 659                         break;
 660                 /* Only unwrap transfer encoding but otherwise do not
 661                  * do anything.  We do *NOT* want UTF-8 conversion
 662                  * here; we are dealing with the user payload.
 663                  */
 664                 decode_transfer_encoding(line);
 665                 fputs(line, patchfile);
 666                 patch_lines++;
 667         } while (fgets(line, sizeof(line), stdin) != NULL);
 668 }
 669
 670 /* multipart boundary and transfer encoding are set up for us, and we
 671  * are at the end of the sub header.  do equivalent of handle_body up
 672  * to the next boundary without closing patchfile --- we will expect
 673  * that the first part to contain commit message and a patch, and
 674  * handle other parts as pure patches.
 675  */
 676 static int handle_multipart_one_part(void)
 677 {
 678         int seen = 0;
 679         int n = 0;
 680         int len;
 681
 682         while (fgets(line, sizeof(line), stdin) != NULL) {
 683         again:
 684                 len = eatspace(line);
 685                 n++;
 686                 if (!len)
 687                         continue;
 688                 if (is_multipart_boundary(line))
 689                         break;
 690                 if (0 <= seen && handle_inbody_header(&seen, line))
 691                         continue;
 692                 seen = -1; /* no more inbody headers */
 693                 line[len] = '\n';
 694                 handle_info();
 695                 if (handle_commit_msg())
 696                         goto again;
 697                 handle_patch();
 698                 break;
 699         }
 700         if (n == 0)
 701                 return -1;
 702         return 0;
 703 }
 704
 705 static void handle_multipart_body(void)
 706 {
 707         int part_num = 0;
 708
 709         /* Skip up to the first boundary */
 710         while (fgets(line, sizeof(line), stdin) != NULL)
 711                 if (is_multipart_boundary(line)) {
 712                         part_num = 1;
 713                         break;
 714                 }
 715         if (!part_num)
 716                 return;
 717         /* We are on boundary line.  Start slurping the subhead. */
 718         while (1) {
 719                 int len = read_one_header_line(line, sizeof(line), stdin);
 720                 if (!len) {
 721                         if (handle_multipart_one_part() < 0)
 722                                 return;
 723                         /* Reset per part headers */
 724                         transfer_encoding = TE_DONTCARE;
 725                         charset[0] = 0;
 726                 }
 727                 else
 728                         check_subheader_line(line, len);
 729         }
 730         fclose(patchfile);
 731         if (!patch_lines) {
 732                 fprintf(stderr, "No patch found\n");
 733                 exit(1);
 734         }
 735 }
 736
 737 /* Non multipart message */
 738 static void handle_body(void)
 739 {
 740         int seen = 0;
 741
 742         while (fgets(line, sizeof(line), stdin) != NULL) {
 743                 int len = eatspace(line);
 744                 if (!len)
 745                         continue;
 746                 if (0 <= seen && handle_inbody_header(&seen, line))
 747                         continue;
 748                 seen = -1; /* no more inbody headers */
 749                 line[len] = '\n';
 750                 handle_info();
 751                 handle_commit_msg();
 752                 handle_patch();
 753                 break;
 754         }
 755         fclose(patchfile);
 756         if (!patch_lines) {
 757                 fprintf(stderr, "No patch found\n");
 758                 exit(1);
 759         }
 760 }
 761
 762 static const char mailinfo_usage[] =
 763         "git-mailinfo [-k] [-u | --encoding=<encoding>] msg patch <mail >info";
 764
 765 int main(int argc, char **argv)
 766 {
 767         /* NEEDSWORK: might want to do the optional .git/ directory
 768          * discovery
 769          */
 770         git_config(git_default_config);
 771
 772         while (1 < argc && argv[1][0] == '-') {
 773                 if (!strcmp(argv[1], "-k"))
 774                         keep_subject = 1;
 775                 else if (!strcmp(argv[1], "-u"))
 776                         metainfo_charset = git_commit_encoding;
 777                 else if (!strncmp(argv[1], "--encoding=", 11))
 778                         metainfo_charset = argv[1] + 11;
 779                 else
 780                         usage(mailinfo_usage);
 781                 argc--; argv++;
 782         }
 783
 784         if (argc != 3)
 785                 usage(mailinfo_usage);
 786         cmitmsg = fopen(argv[1], "w");
 787         if (!cmitmsg) {
 788                 perror(argv[1]);
 789                 exit(1);
 790         }
 791         patchfile = fopen(argv[2], "w");
 792         if (!patchfile) {
 793                 perror(argv[2]);
 794                 exit(1);
 795         }
 796         while (1) {
 797                 int len = read_one_header_line(line, sizeof(line), stdin);
 798                 if (!len) {
 799                         if (multipart_boundary[0])
 800                                 handle_multipart_body();
 801                         else
 802                                 handle_body();
 803                         break;
 804                 }
 805                 check_header_line(line, len);
 806         }
 807         return 0;
 808 }